Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 49
ght angle, it follows that hrc and h c r musttogether make up a right angle, whence taking awayH r c in both cases, it follows, that qra must be equalto rch. Hence we have the very important pro-position which is thus stated :— The elevation of the pole above the horizon is equalthe latitude of the… … Culmination. 31 change in his latitude. In the north the pole appearshigh up in the heavens, in fact at the north pole ofthe earth the celestial pole would be at the zenith.As the traveller proceeds towards the south, the polegradually sinks, until when he is on the equator thepole will be in his…
Astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-378-261.webp)
